from PIL import Image

def change_brightness(img: Image, level: float) -> Image:
    """
    按照给定的亮度等级，改变图片的亮度
    """

    def brightness(c: int) -> float:
        return 128 + level + (c - 128)

    if not -255.0 <= level <= 255.0:
        raise ValueError("level must be between -255.0 (black) and 255.0 (white)")
    return img.point(brightness)


if __name__ == "__main__":
    # 加载图片
    with Image.open("image_data/test.jpg") as img:
        # 改变亮度到100
        brigt_img = change_brightness(img, 100)
        brigt_img.save("image_data/test_brightness.png", format="png")

图片亮度处理前：

图片亮度处理后：

 

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